摘要
评价了滤波器湍流模型在低温流体空化流动计算中的应用。分别采用标准k-ε、修正RNG k-ε和FBM湍流模型对绕对称回转体在液氮中的空化流动进行模拟,并计算了进口湍流度对空化流动的影响。与实验结果对比表明:相对标准k-ε和修正RNG k-ε湍流模型的计算结果,FBM湍流模型可以更好地反映低温流体中汽液混合的空泡界面,更准确捕捉由于热力学效应影响而造成的压力和温度变化,计算得到的结果与实验数据更为接近。标准k-ε和修正RNG k-ε模型对计算工况的进口μT/μL|inlet粘性比比较敏感。采用FBM湍流模型计算,可以明显减小进口μT/μL|inlet粘性比对计算结果的影响。
The application of filter-based turbulent model in the computation of the cryogenic turbulent cavitating flows was evaluated. The standard k-ε, modified RNG k-ε and FBM turbulence models were used to simulate the cavitating flows around an axisymmetric ogive in liquid nitrogen and investigate the influence of the inlet turbulent intensity on the cavitating flows. By comparing the numerical results with the experimental data in a reference, it is shown that the FBM turbulence model can be used to simulate the cavity interface of the vapour-liquid mixture in the cryogenic fluids so much the better, and capture the pressure and temperature distributions around the axisymmetric ogive more accurately. The simulation results obtained by the FBM model are accordant with the experimental data. The standard k-e and mod- ified RNG k-~ models are more sensitive to the inlet eddy-to-laminar viscosity ratio of the calculation ca- ses. The FBM model can be used obviously to reduce the effect of the inlet boundary conditions of μT/μL｜inlet, viscosity ratio on the numerical results.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2012年第4期451-458,共8页
Acta Armamentarii
基金
国家自然科学基金项目(50979004)
高校博士点基金项目(200800070027)
关键词
流体力学
低温流体
空化
湍流模型
湍流度
fluid mechanics
cryogenic fluids
cavitating flows
turbulent model
turbulent intensity
